Fix issue where test fails in solidus > 1.2
Fix issue where test fails in solidus > 1.2

This test had a implicit amount of 1, that came from the original
payment factory.

I assume the factory changed to have an amount of 0.

freerunningtech/solidus-adyen,freerunningtech/solidus-adyen,freerunningtech/solidus-adyen,StemboltHQ/solidus-adyen,StemboltHQ/solidus-adyen,freerunningtech/solidus-adyen,StemboltHQ/solidus-adyen,StemboltHQ/solidus-adyen